What is .FCS file extension?
Save state created by FCEUX, an NES, Famicom, and Famicom Disk System emulator; stores the complete state of a game at a point in time.
FCS files along with other FCEUX files are located in the ~/.fceux directory.
FCEUX is an advanced version of the FCE Ultra emulator. It is designed to provide functions from different FCE Ultra branches, such as FCEU rerecording, FCEUXD, and FCEUXDSP.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.